鳳凰座SX型變星

鳳凰座SX型變星是變星的一種，這些恆星的亮度表現出在0.03～0.08天（0.7～1.9小時）的短週期脈動變化，它們的光譜類型在A2～F5，星等變化可以達到0.7等^[1]。相較於太陽，這些恆星的金屬量較低，這意味着其它元素相較於氫和氦的豐度是較低的。在恆星光譜分類中，相較於同類型的恆星，它們有着較高的空間速度和低光度^[2]^[3]，這些屬性使鳳凰座SX型變星和表兄弟的盾牌座δ型變星有所區別。後著有着較長的週期、高金屬量和較大的變光幅度^[4]。

鳳凰座SX型變星主要分出現在球狀星團和銀暈中，變光週期和亮度明顯的有周光關係^[5]。所有已知在球狀星團中的鳳凰座SX型變都是藍離散星^[6]，這些恆星看起來比在同一個星團中有着相同發光度的主序星更藍 (有着更高的溫度)^[7]。

列表

下表篩選出一些無論業餘或專業天文學家都感興趣的鳳凰座SX型變星。除非另有說明，給定的星等都是V波段。

More information 恆星, 最亮星等 ...

恆星	最亮星等	最暗星等	週期（日）	光譜類型
鳳凰座SX ^{[n 1]}	6.76	7.53	0.055	A2V
HD 94033	9.46	10.26	0.060	B9III/IV
飛馬座DY	10.00	10.56	0.073	F5
寶瓶座CY	10.42	11.20	0.061	B8
大熊座AE^{[n 1]}	10.86	11.52	0.086	A9
天鵝座XX	11.28	12.13	0.135	A5-F5
鹿豹座BL	12.92	13.25	0.039
玉夫座BX	13.42	13.71	0.037	A

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註解

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參考資料

[1]
GCVS Variability Types. General Catalogue of Variable Stars. Moscow, Russia: Russian Foundation for Basic Research, Sternberg Astronomical Institute. [2010-03-17]. （原始內容存檔於2019-09-21）.
[2]
Burki, G.; Mayor, M. Radial velocities with CORAVEL - Results on stellar variability and duplicity. Instrumentation and research programmes for small telescopes; Proceedings of the IAU Symposium. Christchurch, New Zealand: Dordrecht, D. Reidel Publishing Co.: 392. 1986. Bibcode:1986IAUS..118..385B.
[3]
Breger, M. The nature of dwarf Cepheids. V - Analysis and conclusions. Astrophysical Journal, Part 1. Jan 1980, 235: 156. Bibcode:1980ApJ...235..153B. doi:10.1086/157620.
[4]
McNamara, D. H. Period-luminosity relations of SX Phoenicis stars. Astronomical Journal. April 1995, 109 (4): 1751–1756. Bibcode:1995AJ....109.1751M. doi:10.1086/117405.
[5]
Templeton, Matthew. Variable Star of the Season: Delta Scuti and the Delta Scuti variables. American Association of Variable Star Observers. [2021-05-25]. （原始內容存檔於2021-02-16）.
[6]
Jeon, Young-Beom; Lee, Myung Gyoon; Kim, Seung-Lee; Lee, Ho. SX Phoenicis Stars in the Globular Cluster NGC 5466. The Astronomical Journal. July 2004, 128 (1): 11. Bibcode:2004AJ....128..287J. S2CID 17310076. arXiv:astro-ph/0404069 . doi:10.1086/421735.
[7]
Santolamazza, P.; Marconi, M.; Bono, G.; Caputo, F.; Cassisi, S.; Gilliland, R. L. Linear Nonadiabatic Properties of SX Phoenicis Variables. The Astrophysical Journal. June 2001, 554 (2): 1124–1140. Bibcode:2001ApJ...554.1124S. S2CID 17711408. arXiv:astro-ph/0102029 . doi:10.1086/321408.

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[GCVS-1] [1]
GCVS Variability Types. General Catalogue of Variable Stars. Moscow, Russia: Russian Foundation for Basic Research, Sternberg Astronomical Institute. [2010-03-17]. （原始內容存檔於2019-09-21）.

[burki_mayor86-2] [2]
Burki, G.; Mayor, M. Radial velocities with CORAVEL - Results on stellar variability and duplicity. Instrumentation and research programmes for small telescopes; Proceedings of the IAU Symposium. Christchurch, New Zealand: Dordrecht, D. Reidel Publishing Co.: 392. 1986. Bibcode:1986IAUS..118..385B.

[apj235-3] [3]
Breger, M. The nature of dwarf Cepheids. V - Analysis and conclusions. Astrophysical Journal, Part 1. Jan 1980, 235: 156. Bibcode:1980ApJ...235..153B. doi:10.1086/157620.

[aj109-4] [4]
McNamara, D. H. Period-luminosity relations of SX Phoenicis stars. Astronomical Journal. April 1995, 109 (4): 1751–1756. Bibcode:1995AJ....109.1751M. doi:10.1086/117405.

[aavso-5] [5]
Templeton, Matthew. Variable Star of the Season: Delta Scuti and the Delta Scuti variables. American Association of Variable Star Observers. [2021-05-25]. （原始內容存檔於2021-02-16）.

[aj128-6] [6]
Jeon, Young-Beom; Lee, Myung Gyoon; Kim, Seung-Lee; Lee, Ho. SX Phoenicis Stars in the Globular Cluster NGC 5466. The Astronomical Journal. July 2004, 128 (1): 11. Bibcode:2004AJ....128..287J. S2CID 17310076. arXiv:astro-ph/0404069 . doi:10.1086/421735.

[apj554-7] [7]
Santolamazza, P.; Marconi, M.; Bono, G.; Caputo, F.; Cassisi, S.; Gilliland, R. L. Linear Nonadiabatic Properties of SX Phoenicis Variables. The Astrophysical Journal. June 2001, 554 (2): 1124–1140. Bibcode:2001ApJ...554.1124S. S2CID 17711408. arXiv:astro-ph/0102029 . doi:10.1086/321408.

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